Rather than cutting straight across the landscape as modern agricultural boundaries tend to do, the field wall on the southern side of this patch of pasture bends gently outward, tracing a respectful detour around a low circular earthwork that has occupied this east-facing slope for well over a thousand years. That small deviation in the hedgeline is often the first clue that something older is holding its ground beneath the grass.

The site is a rath, the Irish term for a ringfort, which was the dominant form of rural settlement in early medieval Ireland, roughly from the fifth to the twelfth century. A rath typically consisted of a circular area enclosed by one or more earthen banks, and served as a farmstead for a single family and their livestock. The Lismakeery example follows the familiar form: a roughly circular interior enclosed by an earthen bank that survives to an internal height of around 0.6 metres and an external height of approximately one metre. The bank is best preserved along the arc running from south-southeast to northwest, while to the north-northeast it flattens and becomes more scarp-like, dropping to a width of around 1.8 metres and a height of 0.85 metres. A notable dip in the bank on the east-southeast side, some four metres wide and 0.4 metres deep, may mark the original entrance, as entrances to raths were commonly positioned to face east. The interior itself slopes gently downward toward the east, and remains under pasture. The site was recorded by Denis Power and aerial photographs were taken in March 2006 as part of the Archaeological Survey of Ireland.

The earthwork sits on a gentle slope and is subtle enough that a visitor walking the surrounding fields without prior knowledge might easily pass it by. The enclosing bank is low, worn by centuries of grazing, and the interior looks much like the pasture around it. The most legible section of the bank runs from the south-southeast around to the northwest, so approaching from that direction gives the clearest sense of the original structure. The kink in the field boundary to the south is a useful orienting detail, and one that hints at how long-standing features, even modest ones, can quietly shape the working landscape around them long after their original purpose has been forgotten.